JP2022104805A - Lens drive device, camera device and electronic equipment - Google Patents

Abstract

To provide a lens drive device capable of obtaining a stable support characteristic of a suspension wire even when the suspension wire is electronically connected to a circuit substrate.SOLUTION: A lens drive device 1 comprises: a base 25 in which a first metal member 33 is embedded, an FPC 23 that is a circuit board arranged on the base 25, and a suspension wire 24 that is electrically connected to a second coil 16 for OIS, which is a drive source for moving a lens body 5 with respect to the base 25. The first metal member 33 is electrically joined and fixed to the FPC 23 and the suspension wire 24 at different positions when viewed from above and below.SELECTED DRAWING: Figure 8

Description

The present invention relates to a lens driving device, a camera device, and an electronic device used in an electronic device such as a smartphone.

Among the lens drive devices having both an OIS (Optical Image Stabilizer) function and an AF (Auto Focus) function, there is a lens drive device called a latent type. In a latent lens drive device, a lens body and an image sensor are arranged side by side in a direction orthogonal to the incident direction of light from the subject, and the light from the subject is reflected by a prism or a mirror and transmitted through the lens body. Then, the lens is focused on the image sensor and converted into an image signal by the image sensor. Patent Document 1 is a document that discloses a technique related to this type of lens driving device. The lens driving device of Patent Document 1 includes a fixed portion, a movable portion, an elastic element, a driving assembly, and a suspension wire. The fixed part has a housing, a base, a frame, and a circuit board, and the movable part has a carrier. The circuit board sends electrical signals to control the drive assembly and perform OIS and AF functions.

Japanese Unexamined Patent Publication No. 2019-139223A

In the lens drive device of Patent Document 1, a circuit board is arranged on a base, a suspension wire is provided so as to penetrate both the base and the circuit board, and the suspension wire is soldered to the circuit board from the lower side of the base. , Supported and electrically connected to the circuit board. However, in such a configuration, the circuit board is a resin component, and there is a problem that it is difficult to obtain stable support characteristics of the suspension wire.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a lens driving device capable of obtaining stable support characteristics of a suspension wire even when the suspension wire is electrically connected to a circuit board. do.

In order to solve the above problems, in a lens driving device according to a preferred embodiment of the present invention, a base in which a metal member is embedded, a circuit board arranged on the base, and a lens body are moved with respect to the base. A suspension wire that is electrically connected to a drive source for making the metal member is provided, and the metal member is electrically joined and fixed to the circuit board and the suspension wire at different positions when viewed from the vertical direction.

In this embodiment, the metal member has two through holes penetrating in the vertical direction, and the suspension wire has a lower end portion inserted into one of the two through holes so that the lower end portion thereof is inserted from the lower surface side. The circuit board may be soldered to the metal member and electrically bonded and fixed, and the circuit board may be soldered to the metal member from the lower surface side via the through hole of the other of the two through holes and electrically bonded and fixed. ..

Further, the other through hole may be larger than the one through hole.

Also. The periphery of the through hole in the metal member may be bent downward to form a solder accommodating space.

Further, the accommodation space may be formed in a truncated cone shape centered on the through hole.

Further, the circuit board is provided with a pad for electrical connection, and this pad may be soldered to the metal member.

Further, the pad may be connected to an external power source.

Further, a carrier having an attachment portion for attaching the lens body, a coil as the drive source attached to the carrier, and a leaf spring electrically connected to the suspension wire and the coil are further provided. May be good.

Further, an electric component may be attached to the lower surface of the circuit board, and a space for accommodating the electric component may be provided on the base.

Another preferred embodiment of the present invention is a camera device including the above-mentioned lens driving device.

Another preferred embodiment of the present invention is an electronic device including the above-mentioned camera device.

The lens drive device according to the present invention includes a base in which a metal member is embedded, a circuit board arranged on the base, and a suspension wire electrically connected to a drive source for moving the lens body with respect to the base. The metal member is electrically joined and fixed to the circuit board and the suspension wire at different positions when viewed from the vertical direction. The circuit board is electrically joined and fixed to the metal member embedded in the base, and the suspension wire is electrically joined and fixed to the metal member. Therefore, the suspension wire is electrically connected to the circuit board and fixed to the metal member embedded in the base, and it is possible to provide a lens driving device capable of obtaining stable support characteristics of the suspension wire.

It is a front view of the smartphone 9 which mounted the camera device 2 including the lens driving device 1 which is one Embodiment of this invention. It is a perspective view of the lens driving device 1 of FIG. It is a perspective view which disassembled the lens drive device 1 of FIG. It is a perspective view which removed the case 11 from FIG. It is a perspective view which removed the frame 12 from FIG. (A) is a perspective view showing the base 25 of FIG. 4, and (B) is a view showing the metal plate member 30, the first metal member 31, 33 embedded in the resin body of the base 25. (A) is a view of FIG. 6A viewed from the opposite side, and FIG. 6B is a view of FIG. 6B viewed from the opposite side. 6A is a diagram showing a first metal member 33, a suspension wire 24, and a pad 320 of the FPC 23 in FIG. 6A.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the camera device 2 including the lens driving device 1 according to the embodiment of the present invention is housed in the smartphone 9.

The camera device 2 includes an image sensor 3, a mirror 4 that reflects light from a subject, a lens body 5 that guides the light reflected by the mirror 4 to the image sensor 3, and a lens drive device 1 that drives the lens body 5. Has.

Hereinafter, the direction in which the light from the subject is incident is appropriately referred to as the Y direction. Further, one direction in which the light reflected by the mirror 4 is directed toward the lens body 5 is referred to as an X direction, and a direction orthogonal to both the Y direction and the Z direction is referred to as the Z direction. Further, the + Y side may be referred to as an upper side, the −Y side may be referred to as a lower side, the + X side may be referred to as a rear side, the −X side may be referred to as a front side, the + Z side may be referred to as a left side, and the −Z side may be referred to as a right side.

The lens drive device 1 includes a case 11, a frame 12, an OIS first coil 13, an upper leaf spring 14, a carrier 15, an OIS second coil 16, a lower leaf spring 17, an OIS magnet 18, a holder 19, and an AF magnet. 20. It has a detection magnet 21, an AF coil 22, an FPC 23, a suspension wire 24, and a base 25. Of these, the carrier 15, the second coil 16 for OIS, and the magnet 21 for detection constitute a movable portion. Further, the OIS magnet 18, the holder 19, and the AF magnet 20 form an intermediate member. Further, the case 11, the frame 12, the first coil for OIS 13, the coil for AF 22, the FPC 23, and the base 25 form a fixed portion.

The movable portion is supported by the holder 19 of the intermediate member via the upper leaf spring 14 and the lower leaf spring 17. The movable portion can move in the Y direction with respect to the intermediate member. The intermediate member is supported by the base 25 of the fixing portion via the suspension wire 24. The intermediate member can move in the X direction and the Z direction with respect to the fixed portion together with the movable portion that supports the intermediate member. As a result, the movable portion can move in the X direction, the Y direction, and the Z direction with respect to the fixed portion. Further, the first coil 13 for OIS, the second coil 16 for OIS, the magnet 18 for OIS, the magnet 20 for AF, and the coil 22 for AF are drive sources for moving the lens body 5 with respect to the base 25.

The case 11 and the base 25 are combined as a housing. A first opening 110 is provided in the center of the wall on the rear side of the case 11. A second opening 120 is provided in a portion extending from the center of the front wall of the case 11 to the upper wall.

The base 25 is formed by molding the main body of the base 25 into a resin and arranging the metal plate member 30, the first metal member 31, 33 in the resin. At the rear edge of the base 25, there is an upright portion 250 that stands upright on the upper side. An FPC 23, which is a circuit board, is arranged on the base 25.

An opening 253 is provided in the center of the resin body of the base 25 corresponding to the carrier 15. The opening 253 has a T-shape with the front side widened. The metal plate member 30 is embedded in the resin body so as to close the opening 253. A black layer is formed on the surface of the metal plate member 30.

The first metal member 31 has a cross shape having four arms and an intersection. The first metal member 33 has six arms, one connecting arm, and two intersections, and has a shape as if two crosses were connected. The first metal member 31 is provided with one through hole 300 penetrating vertically through the intersection, and the first metal member 33 is provided with one through hole 300 penetrating vertically at each of the two intersections. .. Each arm portion around the through hole 300 of the first metal members 31 and 33 is bent diagonally downward except for the connecting arm portion, and each tip portion is further bent so as to be horizontal. The connecting arm is not bent.

The intersection with one through hole 300 in the first metal member 31 and the intersection with two through holes 300 in the first metal member 33 are exposed from the base 25 on both the upper and lower surfaces. The tip of the left arm of the left first metal members 31 and 33 and the tip of the right arm of the right first metal members 31 and 33 are exposed from the base 25.

A damper gel receiving portion 35 is formed on the upper surface of the base 25. The receiving portion 35 is formed by surrounding the periphery of the through hole 300 of the first metal member 31 and the periphery of the through hole 300 on the front side of the two through holes 300 of the first metal member 33 by a wall, respectively. Dampagel is a resin having viscoelasticity and has a function of attenuating vibration.

A solder accommodating space 39 is formed on the lower surface of the base 25. The accommodation space 39 is formed by being recessed in a truncated cone shape centered on the through hole 300 in the space formed by the first metal members 31 and 33. In the region sandwiched between the receiving portion 35 and the accommodating space 39, the first metal members 31 and 33 are exposed on the upper and lower surfaces.

The lower end of the suspension wire 24 is passed through the through hole 300 on the front side of the first metal member 33 and the through hole 300 of the first metal member 31. The suspension wire 24 penetrates the base 25 and is soldered from the lower surface to the intersection of the front side of the first metal member 33 and the intersection of the first metal member 31 by the solder of the accommodation space 39. The suspension wire 24 is thereby joined and fixed to the first metal members 31 and 33, and is electrically connected to the first metal member 33.

The upper surface of the rear intersection and the connecting arm portion of the first metal member 33 is exposed together with the front intersection, and the rear intersection of the first metal member 33 is also exposed on the upper and lower surfaces. The FPC 23 is attached so as to cover the upper surface of the intersection on the rear side of the first metal member 33. As shown in FIG. 8, the pad 320 for electrical connection of the FPC 23 is placed on the upper surface side of the intersection on the rear side of the first metal member 33, and the first metal member 33 and the pad are placed from the lower surface through the through hole 300. 320 is soldered. That is, the pad 320 is electrically joined and fixed to the first metal member 33. The pad 320 is connected to an external power source, whereby the external power source is electrically connected to the suspension wire 24 from the pad 320 via the first metal member 33. The suspension wire 24 is electrically connected to the second coil 16 for OIS via the upper leaf spring 14.

An X-direction detection Hall element and a Y-direction detection Hall element, which are electrical components, are attached to the lower surface of the FPC 23. The base 25 is provided with an accommodation space 37 for accommodating the X-direction detection Hall element and an accommodation space 38 for accommodating the Y-direction detection Hall element. Convex portions 36 are provided on the left and right sides of the upper surface of the base 25. An AF coil 22 is wound around the convex portion 36 on the upper surface of the FPC 23.

The frame 12 is formed by molding the main body of the frame 12 into a resin and arranging the second metal member 126 in the resin. The end of the second metal member 126 projects from the lower end of the frame 12. The second metal member 126 forms an electric wiring, and serves both for reinforcing the frame 12 and for the electric wiring. The lower end of the frame 12 is fixed to the base 25. The protruding end of the second metal member 126 is electrically connected to the FPC 23.

The frame 12 has two rising portions 121 rising from the left side of the base 25, two rising portions 121 rising from the right side, left and right horizontal portions 122 connecting the two left and right rising portions 121, and left and right horizontal portions. It has a connecting portion 123 that connects the portions 122. The two rising portions 121 face each other in the optical axis direction. On the lower surface of the horizontal portion 122 on the right side of the frame 12, the first coil 13 for OIS and the Hall element for detecting the Z direction, which are electrical components, are provided and are electrically connected to the second metal member 126, respectively. A first coil 13 for OIS, which is an electric component, is provided on the lower surface of the horizontal portion 122 on the left side of the frame 12, and is electrically connected to the second metal member 126.

The holder 19 has a frame portion 191 that surrounds the holder opening 190, and a first wall portion 192 that extends forward from the left and right peripheral edges of the frame portion 191. U-shaped recesses 193 open in the Z direction are provided at the lower ends of the front, rear, left, and right corners of the first wall portion 192. An OIS magnet 18 is provided on the upper surface of the first wall portion 192. An AF magnet 20 is provided on the lower surface of the first wall portion 192. The upper leaf spring 14 is fixed to the upper surface of the holder 19, and the lower leaf spring 17 is fixed to the lower surface. The upper leaf spring 14 has a wire shape extending inward from the front, back, left, and right on the upper side of the holder 19. The lower leaf spring 17 forms a wire that meanders inward from the front, back, left, and right on the lower side of the holder 19.

The carrier 15 is a lens support that supports the lens body 5. The carrier 15 has a tubular body 151 and a second wall portion 152 extending forward from the peripheral portions on the left and right sides of the tubular body 151. The second wall portion 152 is formed by cutting off an upper portion and a lower portion in the front portion of the tubular body 151. The tubular body 151 has a through hole 150. The through hole 150 is an attachment portion of the lens body 5, and the lens body 5 is fitted into the through hole 150 from between the left and right second wall portions 152 of the carrier 15 and attached to the carrier 15 after the lens driving device 1 is completed. Be done. The carrier 15 is supported by the upper leaf springs 14 on the upper front, rear, left and right sides, and by the lower leaf springs 17 on the lower front, back, left, and right sides. The center of gravity of the movable portion including the lens body 5 and the carrier 15 that supports the lens body 5 is substantially at the center of the front, rear, left, and right upper leaf springs 14 and lower leaf springs 17.

A second coil 16 for OIS is provided on the outer surface of the left and right second wall portions 152 of the carrier 15. A detection magnet 21 is provided on the lower surface of the rear portion of the second wall portion 152. Further, the connecting portion 123 of the frame 12 is provided in a portion where the upper portion of the tubular body 151 is cut off, and the tubular body 151 and the connecting portion 123 overlap when viewed from the X direction.

The suspension wire 24 passes through the U-shaped recess 193 of the holder 19 and is erected between the through hole 300 of the base 25 and the upper leaf spring 14. The lower end of the suspension wire 24 is inserted into the through hole 300 of the base 25 and soldered. The upper end of the suspension wire 24 is inserted into and soldered to the tip portion of the upper leaf spring 14 forming the ring shape on the outside of the holder 19.

A damper gel is arranged between the lower end of the suspension wire 24, the U-shaped recess 193 of the holder 19, and the receiving portion 35 of the base 25. The U-shaped recesses 193 are provided at intervals directly above the receiving portion 35, and form a damper gel pool together with the receiving portion 35.

The OIS second coil 16 constituting the movable portion and the OIS magnet 18 constituting the intermediate member face each other. When a current flows through the second coil 16 for OIS, an electromagnetic force in the Y direction is generated in the second coil 16 for OIS, and the movable portion moves in the Y direction with respect to the intermediate member. The Y-direction detection Hall element detects the magnetic field of the opposing detection magnet 21 and outputs a signal indicating the detection result. This signal corresponds to the position of the detection magnet 21 in the Y direction with respect to the Y direction detection Hall element.

The OIS magnet 18 constituting the intermediate member and the OIS first coil 13 constituting the fixing portion face each other. When a current flows through the first coil 13 for OIS, an electromagnetic force in the Z direction is generated in the first coil 13 for OIS, and a reaction force is generated in the magnet 18 for OIS, so that the intermediate member is fixed. It moves in the Z direction with respect to the part. The Z-direction detection Hall element detects the magnetic field of the opposing OIS magnet 18 and outputs a signal indicating the detection result. This signal corresponds to the position of the OIS magnet 18 in the Z direction with respect to the Z direction detection Hall element.

The AF magnet 20 constituting the intermediate member and the AF coil 22 constituting the fixed portion face each other. When a current flows through the AF coil 22, an electromagnetic force in the X direction is generated in the AF coil 22, and a reaction force is generated in the AF magnet 20 so that the intermediate member moves with respect to the fixed portion. , Moves in the X direction. The Hall element for X-direction detection detects the magnetic field of the opposing AF magnet 20 and outputs a signal indicating the detection result. This signal corresponds to the position of the AF magnet 20 in the X direction with respect to the Hall element for detecting the X direction.

The lens driving device 1 in the present embodiment is for moving the base 25 in which the first metal member 33 is embedded, the FPC 23 which is a circuit board arranged on the base 25, and the lens body 5 with respect to the base 25. The first metal member 33 is electrically connected to the FPC 23 and the suspension wire 24 at different positions when viewed from the vertical direction, and is provided with a suspension wire 24 that is electrically connected to the second coil 16 for OIS, which is a drive source of the above. It is fixed. Therefore, the suspension wire 24 is electrically connected to the FPC 23 and fixed to the first metal member 33 embedded in the base, providing the lens driving device 1 capable of obtaining stable support characteristics of the suspension wire 24. be able to.

In the above embodiment, the first metal member 31 may have two through holes 300 having the same shape as the first metal member 33. In this case, the through hole 300 of the two through holes 300 may be soldered through the lower end of the suspension wire 24 so that the other through hole 300 is not used. Further, it may be used for a lens driving device in which light from a subject is not reflected by a prism or a mirror.

Further, the damper gel may be arranged between the U-shaped recess 193 of the holder 19 and the upper surface of the base 25 without providing the receiving portion 35 on the base 25.

1 Lens drive device 2 Camera device 3 Image sensor 4 Mirror 5 Lens body 9 Smartphone 11 Case 12 Frame 13 1st coil for OIS 14 Upper leaf spring 15 Carrier 16 2nd coil for OIS 17 Lower leaf spring 18 Magnet for OIS 19 Holder 20 AF magnet 21 Detection magnet 22 AF coil 23 FPC
24 Suspension wire 25 Base 30 Metal plate member 31, 33 First metal member 35 Receiving part 36 Convex part 37 38 39 Containment space 110 First opening 120 Second opening 121 Raising part 122 Horizontal part 123 Connecting part 126 Second metal member 150 Through hole 151 Cylindrical body 152 Second wall part 190 Holder opening 191 Frame part 192 First wall part 193 U-shaped recess 250 Standing part 253 Opening part 300 Through hole 320 Pad

Claims (11)

A base with embedded metal parts and
The circuit board placed on the base and
It is equipped with a suspension wire that is electrically connected to a drive source for moving the lens body with respect to the base.
The lens driving device is characterized in that the metal member is electrically joined and fixed to the circuit board and the suspension wire at different positions when viewed from above and below. The metal member has two through holes that penetrate in the vertical direction.
The lower end portion of the suspension wire is inserted into the through hole of one of the two through holes and soldered to the metal member from the lower surface side to be electrically joined and fixed.
The lens driving device according to claim 1, wherein the circuit board is soldered to the metal member from the lower surface side through the through hole of the other of the two through holes and is electrically joined and fixed. .. The lens driving device according to claim 2, wherein the other through hole is larger than the one through hole. The lens driving device according to claim 2, wherein the periphery of the through hole in the metal member is bent downward to form a solder accommodating space. The lens driving device according to claim 4, wherein each of the accommodation spaces is formed in a truncated cone shape centered on the through hole. The lens driving device according to claim 1, wherein the circuit board is provided with a pad for electrical connection, and the pad is soldered to the metal member. The lens driving device according to claim 6, wherein the pad is connected to an external power source. A carrier having a mounting portion for mounting the lens body, and
The coil, which is the drive source attached to the carrier,
The lens driving device according to claim 1, further comprising the suspension wire and a leaf spring electrically connected to the coil. The lens driving device according to claim 1, wherein an electric component is attached to the lower surface of the circuit board, and a storage space for the electric component is provided in the base. A camera device including the lens driving device according to any one of claims 1 to 9. An electronic device provided with the camera device according to claim 10.

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